modem?????

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

it seems my modem cannot detect a dial tone to connect to internet. i have
done everything to assure modem is connected to computer. had diagnostic done
and was successful. phone line does work since i plugged in phone. reall do
not know what else to check. any help would be so greatly appreaciated.
 
michele011 said:
it seems my modem
Click to expand...

What is your modem?
cannot detect a dial tone to connect to internet.
Click to expand...

That indicates hardware failure somewhere. Dialtone detection is pretty
basic.

Go into Hyperterminal and type ATH1 <enter>, and the modem should come off
hook and you should hear a dialtone. You may need to use ATM1 to increase
speaker volume. ATH0 (that's a zero, not an uppercase "o") will hang the
modem up again. You should hear at least a click as the modem goes on and
off hook.
i have
done everything to assure modem is connected to computer. had diagnostic
done
and was successful.
Click to expand...

How was this diagnostic done?

It can happen that the diagnostics are successful but parts of the modem are
actually damaged to the point where it can't connect.

Try swapping in another modem.
phone line does work since i plugged in phone.
Click to expand...

With the *same cable* as is connected to the modem?
reall do
not know what else to check. any help would be so greatly appreaciated.
Click to expand...

Most modems have two ports, one for handset and one for the line. Some of
them don't work properly if the cable is plugged into the handset port.

Can you try another modem? If possible, try an external USB modem.
Install the drivers as specified, which sometimes means *before* connecting
the hardware.

You can also usually direct the modem to dial without detecting the
dialtone. In control panel, modems, select the modem, right-click and
choose Properties, on the Modem tab "Dial Control" section remove the
checkmark from "wait for dial tone".

HTH
-pk
 
Hi,

Seen this hundreds of times, the diagnostic tells you little. I've had many
show the diagnostics OK, but the modem has no dial tone. Two things come to
mind. 1. The modem is indeed bad, 2. remove/uninstall from Device Manage and
restart the machine. It will detect the modem again and reinstall the
drivers. The second thing I mentioned has worked many times to correct the
problem.

All the best,
SG
 
Did you use the correct cord (cable) to wire from the phone jack to the
computer (modem)?
 
it seems mymodemcannot detect a dial tone to connect to internet. i have
done everything to assuremodemis connected to computer. had diagnostic done
and was successful.phoneline does work since i plugged inphone.
Click to expand...

Most useful test that modem is connected to phone line is to plug
modem into phone line and attach a phone to the other phone jack on
modem. (Assumes modem with two phone jack connectors). Phone should
work when connected to phone line through modem.

Windows diagnostics can only see modem's computer. Windows cannot
see the other side of that computer - where modem's computer connects
to phone line - also called the DAA interface. Other side is location
of the off hook relay.

The useful reply from Patrick Keenan disucsses Hyperterminal to talk
to the modem's computer. IOW from Hyperterminal, enter on keyboard
AT<ret>
where <ret> stands for the return or Enter key. Modem's computer will
echo your keystrokes to screen, then respond with OK.

Enter AT&F<ret> or ATZ<ret> to reset modem; to see these
responses from modem. Also enter ATM2<ret> to put make modem's
speaker always on.


To have modem dial, enter
ATDT1234567 <ret> where 1234567 is replaced by your phone number or
any ISP phone number. Modem's computer will try to dial out (just
like a telephone) and will probably respond with "No Dialtone
Detected". Now we know which side of modem's computer to find the
problem.

Off hook relay is often damaged when a surge enters on AC mains to
find earth ground, destructively, via the phone line. A PNP
transistor that controls that relay is often damaged. This can happen
with computer on or off. Failed transistor means the relay does not
connect your fully working modem computer to phone line via the DAA
section.

This tiny transistor is easy to replace with a steady hand, a
soldering iron, and some knowledge that even some 13 year olds have.
But I doubt you will do that since a new modem is so inexpensive.

Should the modem be replaced, first go to Device Manager (in
Windows) to remove the original modem's software. Then power down and
take the old modem out.

Finally, if using Hyperterminal, then further information is:
http://www.modemsite.com/56k/x2-hyperterm.asp or
http://www.modemsite.com/56k/usehyper.asp
 
Back
Top